Remove dummy StyleItem inside Slider
Remove dummy StyleItem inside Slider

We should not bind the size to this dummy item, since the delegate
can be changed leading to a wrong implicit size in that case.

Change-Id: Ibeff637dba1ea485abdb6801685f5262a3843ca7
Reviewed-by: Daker Fernandes Pinheiro <7c8be063491dd997a6f8c774cf795e75384ede54@openbossa.org>
Reviewed-by: Jens Bache-Wiig <9cea9d70b08f8210134ec5959114f72bad51ed1d@nokia.com>

jfaust/qtquickcontrols,drgvond/qtquickcontrols,richardmg/qtcomponents,mizukusak/qtquickcontrols,jfaust/qtquickcontrols,kobolabs/qtquickcontrols,drgvond/qtquickcontrols,kobolabs/qtquickcontrols,mizukusak/qtquickcontrols,richardmg/qtcomponents,mizukusak/qtquickcontrols,kobolabs/qtquickcontrols,jfaust/qtquickcontrols,richardmg/qtcomponents,drgvond/qtquickcontrols